Re: [PATCH 09/10] drm/vkms: plane_state->fb iff plane_state->crtc

[Sam Ravnborg <sam@ravnborg.org>]

Hi Rodrigo.

On Tue, Jan 14, 2020 at 06:50:13PM -0500, Rodrigo Siqueira wrote:
> On 12/13, Daniel Vetter wrote:
> > Checking both is one too much, so wrap a WARN_ON around it to stope
> > the copypasta.
> > 
> > Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> > Cc: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
> > Cc: Haneen Mohammed <hamohammed.sa@gmail.com>
> > Cc: Daniel Vetter <daniel@ffwll.ch>
> > ---
> >  drivers/gpu/drm/vkms/vkms_plane.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkms_plane.c
> > index 5fc8f85aaf3d..6d31265a2ab7 100644
> > --- a/drivers/gpu/drm/vkms/vkms_plane.c
> > +++ b/drivers/gpu/drm/vkms/vkms_plane.c
> > @@ -117,7 +117,7 @@ static int vkms_plane_atomic_check(struct drm_plane *plane,
> >  	bool can_position = false;
> >  	int ret;
> >  
> > -	if (!state->fb | !state->crtc)
> > +	if (!state->fb || WARN_ON(!state->crtc))
> >  		return 0;
> >  
> >  	crtc_state = drm_atomic_get_crtc_state(state->state, state->crtc);
> > -- 
> > 2.24.0
> >
> 
> Hi,
> 
> Sorry, the delay in taking a look at this patch.
> 
> I tried to find the whole series for getting the context related to this
> patch, but I could not find it in my mailbox. Could you shed some light
> here? Why check fb and crtc is too much? How the WARN_ON fix the issue?

You can find some background in the first patch:
https://lists.freedesktop.org/archives/dri-devel/2019-December/248981.html

Hope this sched enough light on the topic.

	Sam
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